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<a name="1" href="#1">1</a>   <em class="jxr_comment">/*</em>
<a name="2" href="#2">2</a>   <em class="jxr_comment"> *       Copyright (c) 2009 All rights reserved</em>
<a name="3" href="#3">3</a>   <em class="jxr_comment"> *               Asemantics S.r.l</em>
<a name="4" href="#4">4</a>   <em class="jxr_comment"> *</em>
<a name="5" href="#5">5</a>   <em class="jxr_comment"> * Redistribution and use in source and binary forms, with or without</em>
<a name="6" href="#6">6</a>   <em class="jxr_comment"> * modification, are permitted provided that the following conditions</em>
<a name="7" href="#7">7</a>   <em class="jxr_comment"> * are met:</em>
<a name="8" href="#8">8</a>   <em class="jxr_comment"> *</em>
<a name="9" href="#9">9</a>   <em class="jxr_comment"> * 1. Redistributions of source code must retain the above copyright</em>
<a name="10" href="#10">10</a>  <em class="jxr_comment"> *    notice, this list of conditions and the following disclaimer.</em>
<a name="11" href="#11">11</a>  <em class="jxr_comment"> *</em>
<a name="12" href="#12">12</a>  <em class="jxr_comment"> * 2. Redistributions in binary form must reproduce the above copyright</em>
<a name="13" href="#13">13</a>  <em class="jxr_comment"> *    notice, this list of conditions and the following disclaimer in</em>
<a name="14" href="#14">14</a>  <em class="jxr_comment"> *    the documentation and/or other materials provided with the</em>
<a name="15" href="#15">15</a>  <em class="jxr_comment"> *    distribution.</em>
<a name="16" href="#16">16</a>  <em class="jxr_comment"> *</em>
<a name="17" href="#17">17</a>  <em class="jxr_comment"> * 3. The end-user documentation included with the redistribution,</em>
<a name="18" href="#18">18</a>  <em class="jxr_comment"> *    if any, must include the following acknowledgment:</em>
<a name="19" href="#19">19</a>  <em class="jxr_comment"> *       "This product includes software developed by</em>
<a name="20" href="#20">20</a>  <em class="jxr_comment"> *        Asemantics S.r.l."</em>
<a name="21" href="#21">21</a>  <em class="jxr_comment"> *    Alternately, this acknowledgment may appear in the software itself,</em>
<a name="22" href="#22">22</a>  <em class="jxr_comment"> *    if and wherever such third-party acknowledgments normally appear.</em>
<a name="23" href="#23">23</a>  <em class="jxr_comment"> *</em>
<a name="24" href="#24">24</a>  <em class="jxr_comment"> * 4. All advertising materials mentioning features or use of this software</em>
<a name="25" href="#25">25</a>  <em class="jxr_comment"> *    must display the following acknowledgement:</em>
<a name="26" href="#26">26</a>  <em class="jxr_comment"> *    This product includes software developed by Asemantics S.r.l.</em>
<a name="27" href="#27">27</a>  <em class="jxr_comment"> *    the Semantic Web company, Rome, London, Leiden and its contributors.</em>
<a name="28" href="#28">28</a>  <em class="jxr_comment"> *</em>
<a name="29" href="#29">29</a>  <em class="jxr_comment"> * 5. Neither the name of the company nor the names of its contributors</em>
<a name="30" href="#30">30</a>  <em class="jxr_comment"> *    may be used to endorse or promote products derived from this software</em>
<a name="31" href="#31">31</a>  <em class="jxr_comment"> *    without specific prior written permission.</em>
<a name="32" href="#32">32</a>  <em class="jxr_comment"> *</em>
<a name="33" href="#33">33</a>  <em class="jxr_comment"> * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND</em>
<a name="34" href="#34">34</a>  <em class="jxr_comment"> * ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE</em>
<a name="35" href="#35">35</a>  <em class="jxr_comment"> * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR</em>
<a name="36" href="#36">36</a>  <em class="jxr_comment"> * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE</em>
<a name="37" href="#37">37</a>  <em class="jxr_comment"> * FOR ANY DIRECT, INDIRECT, INCIDENTAL,</em>
<a name="38" href="#38">38</a>  <em class="jxr_comment"> * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT</em>
<a name="39" href="#39">39</a>  <em class="jxr_comment"> * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;</em>
<a name="40" href="#40">40</a>  <em class="jxr_comment"> * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)</em>
<a name="41" href="#41">41</a>  <em class="jxr_comment"> * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,</em>
<a name="42" href="#42">42</a>  <em class="jxr_comment"> * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)</em>
<a name="43" href="#43">43</a>  <em class="jxr_comment"> * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED</em>
<a name="44" href="#44">44</a>  <em class="jxr_comment"> * OF THE POSSIBILITY OF SUCH DAMAGE.</em>
<a name="45" href="#45">45</a>  <em class="jxr_comment"> *</em>
<a name="46" href="#46">46</a>  <em class="jxr_comment"> */</em>
<a name="47" href="#47">47</a>  <strong class="jxr_keyword">package</strong> com.asemantics.memos2;
<a name="48" href="#48">48</a>  
<a name="49" href="#49">49</a>  <strong class="jxr_keyword">import</strong> java.io.IOException;
<a name="50" href="#50">50</a>  <strong class="jxr_keyword">import</strong> java.net.InetSocketAddress;
<a name="51" href="#51">51</a>  <strong class="jxr_keyword">import</strong> java.util.List;
<a name="52" href="#52">52</a>  <strong class="jxr_keyword">import</strong> java.util.Set;
<a name="53" href="#53">53</a>  <strong class="jxr_keyword">import</strong> java.util.concurrent.Future;
<a name="54" href="#54">54</a>  <strong class="jxr_keyword">import</strong> java.util.concurrent.TimeUnit;
<a name="55" href="#55">55</a>  <strong class="jxr_keyword">import</strong> java.util.logging.Level;
<a name="56" href="#56">56</a>  <strong class="jxr_keyword">import</strong> java.util.logging.Logger;
<a name="57" href="#57">57</a>  
<a name="58" href="#58">58</a>  <strong class="jxr_keyword">import</strong> net.spy.memcached.AddrUtil;
<a name="59" href="#59">59</a>  <strong class="jxr_keyword">import</strong> net.spy.memcached.ConnectionFactory;
<a name="60" href="#60">60</a>  <strong class="jxr_keyword">import</strong> net.spy.memcached.DefaultConnectionFactory;
<a name="61" href="#61">61</a>  <strong class="jxr_keyword">import</strong> net.spy.memcached.MemcachedClient;
<a name="62" href="#62">62</a>  
<a name="63" href="#63">63</a>  <strong class="jxr_keyword">import</strong> org.apache.commons.codec.digest.DigestUtils;
<a name="64" href="#64">64</a>  
<a name="65" href="#65">65</a>  <strong class="jxr_keyword">import</strong> com.opensymphony.oscache.base.Config;
<a name="66" href="#66">66</a>  <strong class="jxr_keyword">import</strong> com.opensymphony.oscache.base.persistence.CachePersistenceException;
<a name="67" href="#67">67</a>  <strong class="jxr_keyword">import</strong> com.opensymphony.oscache.base.persistence.PersistenceListener;
<a name="68" href="#68">68</a>  
<a name="69" href="#69">69</a>  <em class="jxr_javadoccomment">/**</em>
<a name="70" href="#70">70</a>  <em class="jxr_javadoccomment"> * A memcached based {@link PersistenceListener} for OSCache.</em>
<a name="71" href="#71">71</a>  <em class="jxr_javadoccomment"> *</em>
<a name="72" href="#72">72</a>  <em class="jxr_javadoccomment"> * To enable it, just set the &lt;code&gt;cache.persistence.class&lt;/code&gt; property in</em>
<a name="73" href="#73">73</a>  <em class="jxr_javadoccomment"> * the classpath resource &lt;code&gt;oscache.properties&lt;/code&gt; as:</em>
<a name="74" href="#74">74</a>  <em class="jxr_javadoccomment"> *</em>
<a name="75" href="#75">75</a>  <em class="jxr_javadoccomment"> * &lt;pre&gt;cache.persistence.class=com.asemantics.memos2.MemcachedListener&lt;/pre&gt;</em>
<a name="76" href="#76">76</a>  <em class="jxr_javadoccomment"> *</em>
<a name="77" href="#77">77</a>  <em class="jxr_javadoccomment"> * Follow below supported properties users can add to &lt;code&gt;oscache.properties&lt;/code&gt;</em>
<a name="78" href="#78">78</a>  <em class="jxr_javadoccomment"> * classpath resource to configure the listener:</em>
<a name="79" href="#79">79</a>  <em class="jxr_javadoccomment"> * &lt;table&gt;</em>
<a name="80" href="#80">80</a>  <em class="jxr_javadoccomment"> * &lt;tr&gt;</em>
<a name="81" href="#81">81</a>  <em class="jxr_javadoccomment"> * &lt;th&gt;property&lt;/th&gt;</em>
<a name="82" href="#82">82</a>  <em class="jxr_javadoccomment"> * &lt;th&gt;description&lt;/th&gt;</em>
<a name="83" href="#83">83</a>  <em class="jxr_javadoccomment"> * &lt;th&gt;default&lt;/th&gt;</em>
<a name="84" href="#84">84</a>  <em class="jxr_javadoccomment"> * &lt;/tr&gt;</em>
<a name="85" href="#85">85</a>  <em class="jxr_javadoccomment"> * &lt;tr&gt;</em>
<a name="86" href="#86">86</a>  <em class="jxr_javadoccomment"> * &lt;td&gt;&lt;code&gt;cache.memcached.servers&lt;/code&gt;&lt;/td&gt;</em>
<a name="87" href="#87">87</a>  <em class="jxr_javadoccomment"> * &lt;td&gt;the &lt;code&gt;${server}:${port}&lt;/code&gt; connection string list&lt;/td&gt;</em>
<a name="88" href="#88">88</a>  <em class="jxr_javadoccomment"> * &lt;td&gt;&lt;code&gt;localhost:11211&lt;/code&gt;&lt;/td&gt;</em>
<a name="89" href="#89">89</a>  <em class="jxr_javadoccomment"> * &lt;/tr&gt;</em>
<a name="90" href="#90">90</a>  <em class="jxr_javadoccomment"> * &lt;tr&gt;</em>
<a name="91" href="#91">91</a>  <em class="jxr_javadoccomment"> * &lt;td&gt;&lt;code&gt;cache.memcached.connectionfactory&lt;/code&gt;&lt;/td&gt;</em>
<a name="92" href="#92">92</a>  <em class="jxr_javadoccomment"> * &lt;td&gt;The &lt;code&gt;net.spy.memcached.ConnectionFactory&lt;/code&gt; class&lt;/td&gt;</em>
<a name="93" href="#93">93</a>  <em class="jxr_javadoccomment"> * &lt;td&gt;&lt;code&gt;net.spy.memcached.DefaultConnectionFactory&lt;/code&gt;&lt;/td&gt;</em>
<a name="94" href="#94">94</a>  <em class="jxr_javadoccomment"> * &lt;/tr&gt;</em>
<a name="95" href="#95">95</a>  <em class="jxr_javadoccomment"> * &lt;tr&gt;</em>
<a name="96" href="#96">96</a>  <em class="jxr_javadoccomment"> * &lt;td&gt;&lt;code&gt;cache.memcached.keyprefix&lt;/code&gt;&lt;/td&gt;</em>
<a name="97" href="#97">97</a>  <em class="jxr_javadoccomment"> * &lt;td&gt;The key prefix, useful when memcached server are shared between more</em>
<a name="98" href="#98">98</a>  <em class="jxr_javadoccomment"> * than one client, to avoid keys collision&lt;/td&gt;</em>
<a name="99" href="#99">99</a>  <em class="jxr_javadoccomment"> * &lt;td&gt;&lt;code&gt;_oscache_&lt;/code&gt;&lt;/td&gt;</em>
<a name="100" href="#100">100</a> <em class="jxr_javadoccomment"> * &lt;/tr&gt;</em>
<a name="101" href="#101">101</a> <em class="jxr_javadoccomment"> * &lt;tr&gt;</em>
<a name="102" href="#102">102</a> <em class="jxr_javadoccomment"> * &lt;td&gt;&lt;code&gt;cache.memcached.groupprefix&lt;/code&gt;&lt;/td&gt;</em>
<a name="103" href="#103">103</a> <em class="jxr_javadoccomment"> * &lt;td&gt;Same for key, but to identify groups; a group is generally stored using</em>
<a name="104" href="#104">104</a> <em class="jxr_javadoccomment"> * &lt;code&gt;cache.memcached.keyprefix&lt;/code&gt;+&lt;code&gt;cache.memcached.groupprefix&lt;/code&gt;</em>
<a name="105" href="#105">105</a> <em class="jxr_javadoccomment"> * concatenation&lt;/td&gt;</em>
<a name="106" href="#106">106</a> <em class="jxr_javadoccomment"> * &lt;td&gt;&lt;code&gt;__group__&lt;/code&gt;&lt;/td&gt;</em>
<a name="107" href="#107">107</a> <em class="jxr_javadoccomment"> * &lt;/tr&gt;</em>
<a name="108" href="#108">108</a> <em class="jxr_javadoccomment"> * &lt;tr&gt;</em>
<a name="109" href="#109">109</a> <em class="jxr_javadoccomment"> * &lt;td&gt;&lt;code&gt;cache.memcached.expiration&lt;/code&gt;&lt;/td&gt;</em>
<a name="110" href="#110">110</a> <em class="jxr_javadoccomment"> * &lt;td&gt;The number of seconds entries will be stored&lt;/td&gt;</em>
<a name="111" href="#111">111</a> <em class="jxr_javadoccomment"> * &lt;td&gt;the number of seconds in 30 days&lt;/td&gt;</em>
<a name="112" href="#112">112</a> <em class="jxr_javadoccomment"> * &lt;/tr&gt;</em>
<a name="113" href="#113">113</a> <em class="jxr_javadoccomment"> * &lt;tr&gt;</em>
<a name="114" href="#114">114</a> <em class="jxr_javadoccomment"> * &lt;td&gt;&lt;code&gt;cache.memcached.asyncget&lt;/code&gt;&lt;/td&gt;</em>
<a name="115" href="#115">115</a> <em class="jxr_javadoccomment"> * &lt;td&gt;Flag to denote if client uses sync/async get&lt;/td&gt;</em>
<a name="116" href="#116">116</a> <em class="jxr_javadoccomment"> * &lt;td&gt;true&lt;/td&gt;</em>
<a name="117" href="#117">117</a> <em class="jxr_javadoccomment"> * &lt;/tr&gt;</em>
<a name="118" href="#118">118</a> <em class="jxr_javadoccomment"> * &lt;tr&gt;</em>
<a name="119" href="#119">119</a> <em class="jxr_javadoccomment"> * &lt;td&gt;&lt;code&gt;cache.memcached.timeout&lt;/code&gt;&lt;/td&gt;</em>
<a name="120" href="#120">120</a> <em class="jxr_javadoccomment"> * &lt;td&gt;The connection timeout for async operations (if set)&lt;/td&gt;</em>
<a name="121" href="#121">121</a> <em class="jxr_javadoccomment"> * &lt;td&gt;&lt;code&gt;5&lt;/code&gt;&lt;/td&gt;</em>
<a name="122" href="#122">122</a> <em class="jxr_javadoccomment"> * &lt;/tr&gt;</em>
<a name="123" href="#123">123</a> <em class="jxr_javadoccomment"> * &lt;tr&gt;</em>
<a name="124" href="#124">124</a> <em class="jxr_javadoccomment"> * &lt;td&gt;&lt;code&gt;cache.memcached.timeoutunit&lt;/code&gt;&lt;/td&gt;</em>
<a name="125" href="#125">125</a> <em class="jxr_javadoccomment"> * &lt;td&gt;The connection timeout unit for async operations&lt;/td&gt;</em>
<a name="126" href="#126">126</a> <em class="jxr_javadoccomment"> * &lt;td&gt;&lt;code&gt;SECONDS&lt;/code&gt;, see {@link TimeUnit} to see admitted values&lt;/td&gt;</em>
<a name="127" href="#127">127</a> <em class="jxr_javadoccomment"> * &lt;/tr&gt;</em>
<a name="128" href="#128">128</a> <em class="jxr_javadoccomment"> * &lt;/table&gt;</em>
<a name="129" href="#129">129</a> <em class="jxr_javadoccomment"> *</em>
<a name="130" href="#130">130</a> <em class="jxr_javadoccomment"> * @author Simone Tripodi (simone.tripodi)</em>
<a name="131" href="#131">131</a> <em class="jxr_javadoccomment"> * @version $Id: MemcachedListener.java 18 2009-05-24 00:31:44Z simone.tripodi $</em>
<a name="132" href="#132">132</a> <em class="jxr_javadoccomment"> */</em>
<a name="133" href="#133">133</a> @SuppressWarnings(<span class="jxr_string">"unchecked"</span>)
<a name="134" href="#134">134</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">class</strong> <a href="../../../com/asemantics/memos2/MemcachedListener.html">MemcachedListener</a> implements PersistenceListener {
<a name="135" href="#135">135</a> 
<a name="136" href="#136">136</a>     <em class="jxr_javadoccomment">/**</em>
<a name="137" href="#137">137</a> <em class="jxr_javadoccomment">     * The &lt;i&gt;cache.memcached.servers&lt;/i&gt; string constant.</em>
<a name="138" href="#138">138</a> <em class="jxr_javadoccomment">     */</em>
<a name="139" href="#139">139</a>     <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> String SERVERS = <span class="jxr_string">"cache.memcached.servers"</span>;
<a name="140" href="#140">140</a> 
<a name="141" href="#141">141</a>     <em class="jxr_javadoccomment">/**</em>
<a name="142" href="#142">142</a> <em class="jxr_javadoccomment">     * The default memcached connection string, &lt;code&gt;localhost:11211&lt;/code&gt;.</em>
<a name="143" href="#143">143</a> <em class="jxr_javadoccomment">     */</em>
<a name="144" href="#144">144</a>     <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> String DEFAULT_SERVERS = <span class="jxr_string">"localhost:11211"</span>;
<a name="145" href="#145">145</a> 
<a name="146" href="#146">146</a>     <em class="jxr_javadoccomment">/**</em>
<a name="147" href="#147">147</a> <em class="jxr_javadoccomment">     * The &lt;i&gt;cache.memcached.connectionfactory&lt;/i&gt; string constant.</em>
<a name="148" href="#148">148</a> <em class="jxr_javadoccomment">     */</em>
<a name="149" href="#149">149</a>     <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> String CONNECTION_FACTORY = <span class="jxr_string">"cache.memcached.connectionfactory"</span>;
<a name="150" href="#150">150</a> 
<a name="151" href="#151">151</a>     <em class="jxr_javadoccomment">/**</em>
<a name="152" href="#152">152</a> <em class="jxr_javadoccomment">     * The default {@link ConnectionFactory} class.</em>
<a name="153" href="#153">153</a> <em class="jxr_javadoccomment">     */</em>
<a name="154" href="#154">154</a>     <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> Class&lt;? <strong class="jxr_keyword">extends</strong> ConnectionFactory&gt; DEFAULT_CONNECTION_FACTORY = DefaultConnectionFactory.<strong class="jxr_keyword">class</strong>;
<a name="155" href="#155">155</a> 
<a name="156" href="#156">156</a>     <em class="jxr_javadoccomment">/**</em>
<a name="157" href="#157">157</a> <em class="jxr_javadoccomment">     * The &lt;i&gt;cache.memcached.keyprefix&lt;/i&gt; string constant.</em>
<a name="158" href="#158">158</a> <em class="jxr_javadoccomment">     */</em>
<a name="159" href="#159">159</a>     <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> String KEY_PREFIX = <span class="jxr_string">"cache.memcached.keyprefix"</span>;
<a name="160" href="#160">160</a> 
<a name="161" href="#161">161</a>     <em class="jxr_javadoccomment">/**</em>
<a name="162" href="#162">162</a> <em class="jxr_javadoccomment">     * The default key prefix, &lt;code&gt;_oscache_&lt;/code&gt;.</em>
<a name="163" href="#163">163</a> <em class="jxr_javadoccomment">     */</em>
<a name="164" href="#164">164</a>     <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> String DEFAULT_KEY_PREFIX = <span class="jxr_string">"_oscache_"</span>;
<a name="165" href="#165">165</a> 
<a name="166" href="#166">166</a>     <em class="jxr_javadoccomment">/**</em>
<a name="167" href="#167">167</a> <em class="jxr_javadoccomment">     * The &lt;i&gt;cache.memcached.groupprefix&lt;/i&gt; string constant.</em>
<a name="168" href="#168">168</a> <em class="jxr_javadoccomment">     */</em>
<a name="169" href="#169">169</a>     <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> String GROUP_PREFIX = <span class="jxr_string">"cache.memcached.groupprefix"</span>;
<a name="170" href="#170">170</a> 
<a name="171" href="#171">171</a>     <em class="jxr_javadoccomment">/**</em>
<a name="172" href="#172">172</a> <em class="jxr_javadoccomment">     * The default key prefix, &lt;code&gt;__group__&lt;/code&gt;.</em>
<a name="173" href="#173">173</a> <em class="jxr_javadoccomment">     */</em>
<a name="174" href="#174">174</a>     <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> String DEFAULT_GROUP_PREFIX = <span class="jxr_string">"__group__"</span>;
<a name="175" href="#175">175</a> 
<a name="176" href="#176">176</a>     <em class="jxr_javadoccomment">/**</em>
<a name="177" href="#177">177</a> <em class="jxr_javadoccomment">     * The &lt;i&gt;cache.memcached.expiration&lt;/i&gt; string constant.</em>
<a name="178" href="#178">178</a> <em class="jxr_javadoccomment">     */</em>
<a name="179" href="#179">179</a>     <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> String EXPIRATION = <span class="jxr_string">"cache.memcached.expiration"</span>;
<a name="180" href="#180">180</a> 
<a name="181" href="#181">181</a>     <em class="jxr_javadoccomment">/**</em>
<a name="182" href="#182">182</a> <em class="jxr_javadoccomment">     * The default memcached entry expiration, the number of seconds in 30 days.</em>
<a name="183" href="#183">183</a> <em class="jxr_javadoccomment">     */</em>
<a name="184" href="#184">184</a>     <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">int</strong> DEFAULT_EXPIRATION = 60 * 60 * 24 * 30;
<a name="185" href="#185">185</a> 
<a name="186" href="#186">186</a>     <em class="jxr_javadoccomment">/**</em>
<a name="187" href="#187">187</a> <em class="jxr_javadoccomment">     * The &lt;i&gt;cache.memcached.timeout&lt;/i&gt; string constant.</em>
<a name="188" href="#188">188</a> <em class="jxr_javadoccomment">     */</em>
<a name="189" href="#189">189</a>     <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> String TIMEOUT = <span class="jxr_string">"cache.memcached.timeout"</span>;
<a name="190" href="#190">190</a> 
<a name="191" href="#191">191</a>     <em class="jxr_javadoccomment">/**</em>
<a name="192" href="#192">192</a> <em class="jxr_javadoccomment">     * The default timeout value, &lt;code&gt;5&lt;/code&gt;.</em>
<a name="193" href="#193">193</a> <em class="jxr_javadoccomment">     */</em>
<a name="194" href="#194">194</a>     <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">int</strong> DEFAULT_TIMEOUT = 5;
<a name="195" href="#195">195</a> 
<a name="196" href="#196">196</a>     <em class="jxr_javadoccomment">/**</em>
<a name="197" href="#197">197</a> <em class="jxr_javadoccomment">     * The &lt;i&gt;cache.memcached.timeoutunit&lt;/i&gt; string constant.</em>
<a name="198" href="#198">198</a> <em class="jxr_javadoccomment">     */</em>
<a name="199" href="#199">199</a>     <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> String TIMEOUT_UNIT = <span class="jxr_string">"cache.memcached.timeoutunit"</span>;
<a name="200" href="#200">200</a> 
<a name="201" href="#201">201</a>     <em class="jxr_javadoccomment">/**</em>
<a name="202" href="#202">202</a> <em class="jxr_javadoccomment">     * The default timeout unit, &lt;code&gt;SECONDS&lt;/code&gt;.</em>
<a name="203" href="#203">203</a> <em class="jxr_javadoccomment">     */</em>
<a name="204" href="#204">204</a>     <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> TimeUnit DEFAULT_TIMEOUT_UNIT = TimeUnit.SECONDS;
<a name="205" href="#205">205</a> 
<a name="206" href="#206">206</a>     <em class="jxr_javadoccomment">/**</em>
<a name="207" href="#207">207</a> <em class="jxr_javadoccomment">     * The &lt;i&gt;cache.memcached.asyncget&lt;/i&gt; string constant.</em>
<a name="208" href="#208">208</a> <em class="jxr_javadoccomment">     */</em>
<a name="209" href="#209">209</a>     <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> String ASYNC_GET = <span class="jxr_string">"cache.memcached.asyncget"</span>;
<a name="210" href="#210">210</a> 
<a name="211" href="#211">211</a>     <em class="jxr_javadoccomment">/**</em>
<a name="212" href="#212">212</a> <em class="jxr_javadoccomment">     * The default flag to use the asynchronous memcached get, &lt;code&gt;true&lt;/code&gt;.</em>
<a name="213" href="#213">213</a> <em class="jxr_javadoccomment">     */</em>
<a name="214" href="#214">214</a>     <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">boolean</strong> DEFAULT_ASYNC_GET = <strong class="jxr_keyword">true</strong>;
<a name="215" href="#215">215</a> 
<a name="216" href="#216">216</a>     <em class="jxr_javadoccomment">/**</em>
<a name="217" href="#217">217</a> <em class="jxr_javadoccomment">     * This class logger.</em>
<a name="218" href="#218">218</a> <em class="jxr_javadoccomment">     */</em>
<a name="219" href="#219">219</a>     <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">final</strong> Logger logger = Logger.getLogger(<strong class="jxr_keyword">this</strong>.getClass().getName());
<a name="220" href="#220">220</a> 
<a name="221" href="#221">221</a>     <em class="jxr_javadoccomment">/**</em>
<a name="222" href="#222">222</a> <em class="jxr_javadoccomment">     * The memcached client reference.</em>
<a name="223" href="#223">223</a> <em class="jxr_javadoccomment">     */</em>
<a name="224" href="#224">224</a>     <strong class="jxr_keyword">private</strong> MemcachedClient memcachedClient;
<a name="225" href="#225">225</a> 
<a name="226" href="#226">226</a>     <em class="jxr_javadoccomment">/**</em>
<a name="227" href="#227">227</a> <em class="jxr_javadoccomment">     * The key prefix reference.</em>
<a name="228" href="#228">228</a> <em class="jxr_javadoccomment">     */</em>
<a name="229" href="#229">229</a>     <strong class="jxr_keyword">private</strong> String keyPrefix;
<a name="230" href="#230">230</a> 
<a name="231" href="#231">231</a>     <em class="jxr_javadoccomment">/**</em>
<a name="232" href="#232">232</a> <em class="jxr_javadoccomment">     * The group prefix reference.</em>
<a name="233" href="#233">233</a> <em class="jxr_javadoccomment">     */</em>
<a name="234" href="#234">234</a>     <strong class="jxr_keyword">private</strong> String groupPrefix;
<a name="235" href="#235">235</a> 
<a name="236" href="#236">236</a>     <em class="jxr_javadoccomment">/**</em>
<a name="237" href="#237">237</a> <em class="jxr_javadoccomment">     * The flag to switch from sync to async memcached get.</em>
<a name="238" href="#238">238</a> <em class="jxr_javadoccomment">     */</em>
<a name="239" href="#239">239</a>     <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">boolean</strong> usingAsyncGet;
<a name="240" href="#240">240</a> 
<a name="241" href="#241">241</a>     <em class="jxr_javadoccomment">/**</em>
<a name="242" href="#242">242</a> <em class="jxr_javadoccomment">     * The memcached entries expiration time.</em>
<a name="243" href="#243">243</a> <em class="jxr_javadoccomment">     */</em>
<a name="244" href="#244">244</a>     <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">int</strong> expiration;
<a name="245" href="#245">245</a> 
<a name="246" href="#246">246</a>     <em class="jxr_javadoccomment">/**</em>
<a name="247" href="#247">247</a> <em class="jxr_javadoccomment">     * The memcached connection timeout.</em>
<a name="248" href="#248">248</a> <em class="jxr_javadoccomment">     */</em>
<a name="249" href="#249">249</a>     <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">int</strong> timeout;
<a name="250" href="#250">250</a> 
<a name="251" href="#251">251</a>     <em class="jxr_javadoccomment">/**</em>
<a name="252" href="#252">252</a> <em class="jxr_javadoccomment">     * The timeout unit.</em>
<a name="253" href="#253">253</a> <em class="jxr_javadoccomment">     */</em>
<a name="254" href="#254">254</a>     <strong class="jxr_keyword">private</strong> TimeUnit timeUnit;
<a name="255" href="#255">255</a> 
<a name="256" href="#256">256</a>     <em class="jxr_javadoccomment">/**</em>
<a name="257" href="#257">257</a> <em class="jxr_javadoccomment">     * {@inheritDoc}</em>
<a name="258" href="#258">258</a> <em class="jxr_javadoccomment">     */</em>
<a name="259" href="#259">259</a>     <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> clear() <strong class="jxr_keyword">throws</strong> CachePersistenceException {
<a name="260" href="#260">260</a>         <em class="jxr_comment">// TODO is there a way to clean and disconnect the memcached client?!?</em>
<a name="261" href="#261">261</a>     }
<a name="262" href="#262">262</a> 
<a name="263" href="#263">263</a>     <em class="jxr_javadoccomment">/**</em>
<a name="264" href="#264">264</a> <em class="jxr_javadoccomment">     * {@inheritDoc}</em>
<a name="265" href="#265">265</a> <em class="jxr_javadoccomment">     */</em>
<a name="266" href="#266">266</a>     <strong class="jxr_keyword">public</strong> PersistenceListener configure(Config config) {
<a name="267" href="#267">267</a>         ConnectionFactory connectionFactory = <strong class="jxr_keyword">this</strong>.getConnectionFactory(config);
<a name="268" href="#268">268</a> 
<a name="269" href="#269">269</a>         String servers = <strong class="jxr_keyword">this</strong>.getStringProperty(config, SERVERS, DEFAULT_SERVERS);
<a name="270" href="#270">270</a>         List&lt;InetSocketAddress&gt; addresses = AddrUtil.getAddresses(servers);
<a name="271" href="#271">271</a> 
<a name="272" href="#272">272</a>         <strong class="jxr_keyword">this</strong>.keyPrefix = <strong class="jxr_keyword">this</strong>.getStringProperty(config, KEY_PREFIX, DEFAULT_KEY_PREFIX);
<a name="273" href="#273">273</a>         <strong class="jxr_keyword">this</strong>.groupPrefix = <strong class="jxr_keyword">this</strong>.getStringProperty(config, GROUP_PREFIX, DEFAULT_GROUP_PREFIX);
<a name="274" href="#274">274</a>         <strong class="jxr_keyword">this</strong>.expiration = <strong class="jxr_keyword">this</strong>.getIntProperty(config, EXPIRATION, DEFAULT_EXPIRATION);
<a name="275" href="#275">275</a>         <strong class="jxr_keyword">this</strong>.timeout = <strong class="jxr_keyword">this</strong>.getIntProperty(config, TIMEOUT, DEFAULT_TIMEOUT);
<a name="276" href="#276">276</a>         <strong class="jxr_keyword">this</strong>.timeUnit = <strong class="jxr_keyword">this</strong>.getTimeUnitProperty(config);
<a name="277" href="#277">277</a>         <strong class="jxr_keyword">this</strong>.usingAsyncGet = <strong class="jxr_keyword">this</strong>.getBooleanProperty(config, ASYNC_GET, DEFAULT_ASYNC_GET);
<a name="278" href="#278">278</a> 
<a name="279" href="#279">279</a>         <strong class="jxr_keyword">if</strong> (<strong class="jxr_keyword">this</strong>.logger.isLoggable(Level.FINE)) {
<a name="280" href="#280">280</a>             <strong class="jxr_keyword">this</strong>.logger.fine(<span class="jxr_string">"Creating new memcached client using configuration: { servers='"</span>
<a name="281" href="#281">281</a>                     + servers
<a name="282" href="#282">282</a>                     +<span class="jxr_string">"', connectionFactory='"</span>
<a name="283" href="#283">283</a>                     + connectionFactory.getClass().getName()
<a name="284" href="#284">284</a>                     + <span class="jxr_string">"', keyPrefix='"</span>
<a name="285" href="#285">285</a>                     + <strong class="jxr_keyword">this</strong>.keyPrefix
<a name="286" href="#286">286</a>                     + <span class="jxr_string">"', groupPrefix='"</span>
<a name="287" href="#287">287</a>                     + <strong class="jxr_keyword">this</strong>.groupPrefix
<a name="288" href="#288">288</a>                     + <span class="jxr_string">"', timeout='"</span>
<a name="289" href="#289">289</a>                     + <strong class="jxr_keyword">this</strong>.timeout
<a name="290" href="#290">290</a>                     + <span class="jxr_string">"', timeUnit='"</span>
<a name="291" href="#291">291</a>                     + <strong class="jxr_keyword">this</strong>.timeUnit
<a name="292" href="#292">292</a>                     + <span class="jxr_string">"', usingAsyncGet='"</span>
<a name="293" href="#293">293</a>                     + <strong class="jxr_keyword">this</strong>.usingAsyncGet
<a name="294" href="#294">294</a>                     + <span class="jxr_string">"' }"</span>);
<a name="295" href="#295">295</a>         }
<a name="296" href="#296">296</a> 
<a name="297" href="#297">297</a>         <strong class="jxr_keyword">try</strong> {
<a name="298" href="#298">298</a>             <strong class="jxr_keyword">this</strong>.memcachedClient = <strong class="jxr_keyword">new</strong> MemcachedClient(connectionFactory, addresses);
<a name="299" href="#299">299</a>         } <strong class="jxr_keyword">catch</strong> (IOException e) {
<a name="300" href="#300">300</a>             String message = <span class="jxr_string">"Impossible to instantiate a new memecached client instance, see nested exceptions"</span>;
<a name="301" href="#301">301</a>             <strong class="jxr_keyword">if</strong> (<strong class="jxr_keyword">this</strong>.logger.isLoggable(Level.SEVERE)) {
<a name="302" href="#302">302</a>                 <strong class="jxr_keyword">this</strong>.logger.log(Level.SEVERE, message, e);
<a name="303" href="#303">303</a>             }
<a name="304" href="#304">304</a>             <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> RuntimeException(message, e);
<a name="305" href="#305">305</a>         }
<a name="306" href="#306">306</a> 
<a name="307" href="#307">307</a>         <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">this</strong>;
<a name="308" href="#308">308</a>     }
<a name="309" href="#309">309</a> 
<a name="310" href="#310">310</a>     <em class="jxr_javadoccomment">/**</em>
<a name="311" href="#311">311</a> <em class="jxr_javadoccomment">     * {@inheritDoc}</em>
<a name="312" href="#312">312</a> <em class="jxr_javadoccomment">     */</em>
<a name="313" href="#313">313</a>     <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">boolean</strong> isGroupStored(String groupName) <strong class="jxr_keyword">throws</strong> CachePersistenceException {
<a name="314" href="#314">314</a>         <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">this</strong>.retrieveGroup(groupName) != <strong class="jxr_keyword">null</strong>;
<a name="315" href="#315">315</a>     }
<a name="316" href="#316">316</a> 
<a name="317" href="#317">317</a>     <em class="jxr_javadoccomment">/**</em>
<a name="318" href="#318">318</a> <em class="jxr_javadoccomment">     * {@inheritDoc}</em>
<a name="319" href="#319">319</a> <em class="jxr_javadoccomment">     */</em>
<a name="320" href="#320">320</a>     <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">boolean</strong> isStored(String key) <strong class="jxr_keyword">throws</strong> CachePersistenceException {
<a name="321" href="#321">321</a>         <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">this</strong>.retrieve(key) != <strong class="jxr_keyword">null</strong>;
<a name="322" href="#322">322</a>     }
<a name="323" href="#323">323</a> 
<a name="324" href="#324">324</a>     <em class="jxr_javadoccomment">/**</em>
<a name="325" href="#325">325</a> <em class="jxr_javadoccomment">     * {@inheritDoc}</em>
<a name="326" href="#326">326</a> <em class="jxr_javadoccomment">     */</em>
<a name="327" href="#327">327</a>     <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> remove(String key) <strong class="jxr_keyword">throws</strong> CachePersistenceException {
<a name="328" href="#328">328</a>         String hashedKey = <strong class="jxr_keyword">this</strong>.buildHashedKey(key);
<a name="329" href="#329">329</a> 
<a name="330" href="#330">330</a>         <strong class="jxr_keyword">if</strong> (<strong class="jxr_keyword">this</strong>.logger.isLoggable(Level.FINE)) {
<a name="331" href="#331">331</a>             <strong class="jxr_keyword">this</strong>.logger.fine(<span class="jxr_string">"Removing cached object with key='"</span>
<a name="332" href="#332">332</a>                     + key
<a name="333" href="#333">333</a>                     + <span class="jxr_string">"' hashedKey='"</span>
<a name="334" href="#334">334</a>                     + hashedKey
<a name="335" href="#335">335</a>                     + <span class="jxr_string">"'"</span>);
<a name="336" href="#336">336</a>         }
<a name="337" href="#337">337</a> 
<a name="338" href="#338">338</a>         <strong class="jxr_keyword">this</strong>.memcachedClient.delete(key);
<a name="339" href="#339">339</a>     }
<a name="340" href="#340">340</a> 
<a name="341" href="#341">341</a>     <em class="jxr_javadoccomment">/**</em>
<a name="342" href="#342">342</a> <em class="jxr_javadoccomment">     * {@inheritDoc}</em>
<a name="343" href="#343">343</a> <em class="jxr_javadoccomment">     */</em>
<a name="344" href="#344">344</a>     <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> removeGroup(String groupName) <strong class="jxr_keyword">throws</strong> CachePersistenceException {
<a name="345" href="#345">345</a>         String hashedGroupName = <strong class="jxr_keyword">this</strong>.buildHashedGroupKey(groupName);
<a name="346" href="#346">346</a> 
<a name="347" href="#347">347</a>         <strong class="jxr_keyword">if</strong> (<strong class="jxr_keyword">this</strong>.logger.isLoggable(Level.FINE)) {
<a name="348" href="#348">348</a>             <strong class="jxr_keyword">this</strong>.logger.fine(<span class="jxr_string">"Looking for cached gruop with groupName='"</span>
<a name="349" href="#349">349</a>                     + groupName
<a name="350" href="#350">350</a>                     + <span class="jxr_string">"' hashedGroupName='"</span>
<a name="351" href="#351">351</a>                     + hashedGroupName
<a name="352" href="#352">352</a>                     + <span class="jxr_string">"'"</span>);
<a name="353" href="#353">353</a>         }
<a name="354" href="#354">354</a> 
<a name="355" href="#355">355</a>         <strong class="jxr_keyword">this</strong>.memcachedClient.delete(hashedGroupName);
<a name="356" href="#356">356</a>     }
<a name="357" href="#357">357</a> 
<a name="358" href="#358">358</a>     <em class="jxr_javadoccomment">/**</em>
<a name="359" href="#359">359</a> <em class="jxr_javadoccomment">     * {@inheritDoc}</em>
<a name="360" href="#360">360</a> <em class="jxr_javadoccomment">     */</em>
<a name="361" href="#361">361</a>     <strong class="jxr_keyword">public</strong> Object retrieve(String key) <strong class="jxr_keyword">throws</strong> CachePersistenceException {
<a name="362" href="#362">362</a>         String hashedKey = <strong class="jxr_keyword">this</strong>.buildHashedKey(key);
<a name="363" href="#363">363</a> 
<a name="364" href="#364">364</a>         <strong class="jxr_keyword">if</strong> (<strong class="jxr_keyword">this</strong>.logger.isLoggable(Level.FINE)) {
<a name="365" href="#365">365</a>             <strong class="jxr_keyword">this</strong>.logger.fine(<span class="jxr_string">"Looking for cached object with key='"</span>
<a name="366" href="#366">366</a>                     + key
<a name="367" href="#367">367</a>                     + <span class="jxr_string">"' hashedKey='"</span>
<a name="368" href="#368">368</a>                     + hashedKey
<a name="369" href="#369">369</a>                     + <span class="jxr_string">"' using async get="</span>
<a name="370" href="#370">370</a>                     + <strong class="jxr_keyword">this</strong>.usingAsyncGet);
<a name="371" href="#371">371</a>         }
<a name="372" href="#372">372</a> 
<a name="373" href="#373">373</a>         <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">this</strong>.retrieveFromMemcached(hashedKey);
<a name="374" href="#374">374</a>     }
<a name="375" href="#375">375</a> 
<a name="376" href="#376">376</a>     <em class="jxr_javadoccomment">/**</em>
<a name="377" href="#377">377</a> <em class="jxr_javadoccomment">     * {@inheritDoc}</em>
<a name="378" href="#378">378</a> <em class="jxr_javadoccomment">     */</em>
<a name="379" href="#379">379</a>     <strong class="jxr_keyword">public</strong> Set retrieveGroup(String groupName) <strong class="jxr_keyword">throws</strong> CachePersistenceException {
<a name="380" href="#380">380</a>         String hashedGroupName = <strong class="jxr_keyword">this</strong>.buildHashedGroupKey(groupName);
<a name="381" href="#381">381</a> 
<a name="382" href="#382">382</a>         <strong class="jxr_keyword">if</strong> (<strong class="jxr_keyword">this</strong>.logger.isLoggable(Level.FINE)) {
<a name="383" href="#383">383</a>             <strong class="jxr_keyword">this</strong>.logger.fine(<span class="jxr_string">"Looking for cached group with groupName='"</span>
<a name="384" href="#384">384</a>                     + groupName
<a name="385" href="#385">385</a>                     + <span class="jxr_string">"' hashedGroupName='"</span>
<a name="386" href="#386">386</a>                     + hashedGroupName
<a name="387" href="#387">387</a>                     + <span class="jxr_string">"'"</span>);
<a name="388" href="#388">388</a>         }
<a name="389" href="#389">389</a> 
<a name="390" href="#390">390</a>         <strong class="jxr_keyword">return</strong> (Set) <strong class="jxr_keyword">this</strong>.retrieveFromMemcached(hashedGroupName);
<a name="391" href="#391">391</a>     }
<a name="392" href="#392">392</a> 
<a name="393" href="#393">393</a>     <em class="jxr_javadoccomment">/**</em>
<a name="394" href="#394">394</a> <em class="jxr_javadoccomment">     * {@inheritDoc}</em>
<a name="395" href="#395">395</a> <em class="jxr_javadoccomment">     */</em>
<a name="396" href="#396">396</a>     <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> store(String key, Object obj) <strong class="jxr_keyword">throws</strong> CachePersistenceException {
<a name="397" href="#397">397</a>         String hashedKey = <strong class="jxr_keyword">this</strong>.buildHashedKey(key);
<a name="398" href="#398">398</a>         <strong class="jxr_keyword">this</strong>.storeInMemcached(hashedKey, obj);
<a name="399" href="#399">399</a>     }
<a name="400" href="#400">400</a> 
<a name="401" href="#401">401</a>     <em class="jxr_javadoccomment">/**</em>
<a name="402" href="#402">402</a> <em class="jxr_javadoccomment">     * {@inheritDoc}</em>
<a name="403" href="#403">403</a> <em class="jxr_javadoccomment">     */</em>
<a name="404" href="#404">404</a>     <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> storeGroup(String groupName, Set group) <strong class="jxr_keyword">throws</strong> CachePersistenceException {
<a name="405" href="#405">405</a>         String hashedGroupName = <strong class="jxr_keyword">this</strong>.buildHashedGroupKey(groupName);
<a name="406" href="#406">406</a>         <strong class="jxr_keyword">this</strong>.storeInMemcached(hashedGroupName, group);
<a name="407" href="#407">407</a>     }
<a name="408" href="#408">408</a> 
<a name="409" href="#409">409</a>     <em class="jxr_javadoccomment">/**</em>
<a name="410" href="#410">410</a> <em class="jxr_javadoccomment">     * </em>
<a name="411" href="#411">411</a> <em class="jxr_javadoccomment">     * @param config</em>
<a name="412" href="#412">412</a> <em class="jxr_javadoccomment">     * @param propName</em>
<a name="413" href="#413">413</a> <em class="jxr_javadoccomment">     * @param defaultValue</em>
<a name="414" href="#414">414</a> <em class="jxr_javadoccomment">     * @return</em>
<a name="415" href="#415">415</a> <em class="jxr_javadoccomment">     */</em>
<a name="416" href="#416">416</a>     <strong class="jxr_keyword">private</strong> String getStringProperty(<strong class="jxr_keyword">final</strong> Config config, <strong class="jxr_keyword">final</strong> String propName,
<a name="417" href="#417">417</a>             <strong class="jxr_keyword">final</strong> String defaultValue){
<a name="418" href="#418">418</a>         String value = config.getProperty(propName);
<a name="419" href="#419">419</a>         <strong class="jxr_keyword">if</strong> (value != <strong class="jxr_keyword">null</strong>) {
<a name="420" href="#420">420</a>             <strong class="jxr_keyword">if</strong> (<strong class="jxr_keyword">this</strong>.logger.isLoggable(Level.FINE)) {
<a name="421" href="#421">421</a>                 <strong class="jxr_keyword">this</strong>.logger.fine(<span class="jxr_string">"Retrieved property '"</span>
<a name="422" href="#422">422</a>                         + propName
<a name="423" href="#423">423</a>                         + <span class="jxr_string">"' from the config with value '"</span>
<a name="424" href="#424">424</a>                         + value
<a name="425" href="#425">425</a>                         + <span class="jxr_string">"'"</span>);
<a name="426" href="#426">426</a>             }
<a name="427" href="#427">427</a> 
<a name="428" href="#428">428</a>             <strong class="jxr_keyword">return</strong> value;
<a name="429" href="#429">429</a>         }
<a name="430" href="#430">430</a> 
<a name="431" href="#431">431</a>         <strong class="jxr_keyword">if</strong> (<strong class="jxr_keyword">this</strong>.logger.isLoggable(Level.FINE)) {
<a name="432" href="#432">432</a>             <strong class="jxr_keyword">this</strong>.logger.fine(<span class="jxr_string">"Property '"</span>
<a name="433" href="#433">433</a>                     + propName
<a name="434" href="#434">434</a>                     + <span class="jxr_string">"' not specified in the config, using default value '"</span>
<a name="435" href="#435">435</a>                     + defaultValue
<a name="436" href="#436">436</a>                     + <span class="jxr_string">"'"</span>);
<a name="437" href="#437">437</a>         }
<a name="438" href="#438">438</a> 
<a name="439" href="#439">439</a>         <strong class="jxr_keyword">return</strong> defaultValue;
<a name="440" href="#440">440</a>     }
<a name="441" href="#441">441</a> 
<a name="442" href="#442">442</a>     <em class="jxr_javadoccomment">/**</em>
<a name="443" href="#443">443</a> <em class="jxr_javadoccomment">     * </em>
<a name="444" href="#444">444</a> <em class="jxr_javadoccomment">     * @param config</em>
<a name="445" href="#445">445</a> <em class="jxr_javadoccomment">     * @param propName</em>
<a name="446" href="#446">446</a> <em class="jxr_javadoccomment">     * @param defaultValue</em>
<a name="447" href="#447">447</a> <em class="jxr_javadoccomment">     * @return</em>
<a name="448" href="#448">448</a> <em class="jxr_javadoccomment">     */</em>
<a name="449" href="#449">449</a>     <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">boolean</strong> getBooleanProperty(<strong class="jxr_keyword">final</strong> Config config, <strong class="jxr_keyword">final</strong> String propName,
<a name="450" href="#450">450</a>             <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">boolean</strong> defaultValue) {
<a name="451" href="#451">451</a>         String value = getStringProperty(config, propName, <strong class="jxr_keyword">null</strong>);
<a name="452" href="#452">452</a>         <strong class="jxr_keyword">try</strong> {
<a name="453" href="#453">453</a>             <strong class="jxr_keyword">if</strong> (value != <strong class="jxr_keyword">null</strong>) {
<a name="454" href="#454">454</a>                 <strong class="jxr_keyword">return</strong> Boolean.parseBoolean(value);
<a name="455" href="#455">455</a>             }
<a name="456" href="#456">456</a>         } <strong class="jxr_keyword">catch</strong> (Exception e){
<a name="457" href="#457">457</a>             <strong class="jxr_keyword">if</strong> (<strong class="jxr_keyword">this</strong>.logger.isLoggable(Level.SEVERE)) {
<a name="458" href="#458">458</a>                 <strong class="jxr_keyword">this</strong>.logger.log(Level.SEVERE, <span class="jxr_string">"Error parsing value '"</span>
<a name="459" href="#459">459</a>                         + value
<a name="460" href="#460">460</a>                         + <span class="jxr_string">"', using default value '"</span>
<a name="461" href="#461">461</a>                         + defaultValue
<a name="462" href="#462">462</a>                         + <span class="jxr_string">"'"</span>, e);
<a name="463" href="#463">463</a>             }
<a name="464" href="#464">464</a>         }
<a name="465" href="#465">465</a>         <strong class="jxr_keyword">return</strong> defaultValue;
<a name="466" href="#466">466</a>     }
<a name="467" href="#467">467</a> 
<a name="468" href="#468">468</a>     <em class="jxr_javadoccomment">/**</em>
<a name="469" href="#469">469</a> <em class="jxr_javadoccomment">     * </em>
<a name="470" href="#470">470</a> <em class="jxr_javadoccomment">     * @param config</em>
<a name="471" href="#471">471</a> <em class="jxr_javadoccomment">     * @param propName</em>
<a name="472" href="#472">472</a> <em class="jxr_javadoccomment">     * @param defaultValue</em>
<a name="473" href="#473">473</a> <em class="jxr_javadoccomment">     * @return</em>
<a name="474" href="#474">474</a> <em class="jxr_javadoccomment">     */</em>
<a name="475" href="#475">475</a>     <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">int</strong> getIntProperty(<strong class="jxr_keyword">final</strong> Config config, <strong class="jxr_keyword">final</strong> String propName,
<a name="476" href="#476">476</a>             <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">int</strong> defaultValue) {
<a name="477" href="#477">477</a>         String value = getStringProperty(config, propName, <strong class="jxr_keyword">null</strong>);
<a name="478" href="#478">478</a>         <strong class="jxr_keyword">try</strong> {
<a name="479" href="#479">479</a>             <strong class="jxr_keyword">if</strong> (value != <strong class="jxr_keyword">null</strong>) {
<a name="480" href="#480">480</a>                 <strong class="jxr_keyword">return</strong> Integer.parseInt(value);
<a name="481" href="#481">481</a>             }
<a name="482" href="#482">482</a>         } <strong class="jxr_keyword">catch</strong> (Exception e){
<a name="483" href="#483">483</a>             <strong class="jxr_keyword">if</strong> (<strong class="jxr_keyword">this</strong>.logger.isLoggable(Level.SEVERE)) {
<a name="484" href="#484">484</a>                 <strong class="jxr_keyword">this</strong>.logger.log(Level.SEVERE, <span class="jxr_string">"Error parsing value '"</span>
<a name="485" href="#485">485</a>                         + value
<a name="486" href="#486">486</a>                         + <span class="jxr_string">"', using default value '"</span>
<a name="487" href="#487">487</a>                         + defaultValue
<a name="488" href="#488">488</a>                         + <span class="jxr_string">"'"</span>, e);
<a name="489" href="#489">489</a>             }
<a name="490" href="#490">490</a>         }
<a name="491" href="#491">491</a>         <strong class="jxr_keyword">return</strong> defaultValue;
<a name="492" href="#492">492</a>     }
<a name="493" href="#493">493</a> 
<a name="494" href="#494">494</a>     <em class="jxr_javadoccomment">/**</em>
<a name="495" href="#495">495</a> <em class="jxr_javadoccomment">     * </em>
<a name="496" href="#496">496</a> <em class="jxr_javadoccomment">     * @param config</em>
<a name="497" href="#497">497</a> <em class="jxr_javadoccomment">     * @return</em>
<a name="498" href="#498">498</a> <em class="jxr_javadoccomment">     */</em>
<a name="499" href="#499">499</a>     <strong class="jxr_keyword">private</strong> TimeUnit getTimeUnitProperty(<strong class="jxr_keyword">final</strong> Config config) {
<a name="500" href="#500">500</a>         String value = <strong class="jxr_keyword">this</strong>.getStringProperty(config, TIMEOUT_UNIT, <strong class="jxr_keyword">null</strong>);
<a name="501" href="#501">501</a> 
<a name="502" href="#502">502</a>         <strong class="jxr_keyword">try</strong> {
<a name="503" href="#503">503</a>             <strong class="jxr_keyword">if</strong> (value != <strong class="jxr_keyword">null</strong>) {
<a name="504" href="#504">504</a>                 <strong class="jxr_keyword">return</strong> TimeUnit.valueOf(value.toUpperCase());
<a name="505" href="#505">505</a>             }
<a name="506" href="#506">506</a>         } <strong class="jxr_keyword">catch</strong> (Exception e) {
<a name="507" href="#507">507</a>             <strong class="jxr_keyword">if</strong> (<strong class="jxr_keyword">this</strong>.logger.isLoggable(Level.SEVERE)) {
<a name="508" href="#508">508</a>                 <strong class="jxr_keyword">this</strong>.logger.log(Level.SEVERE, <span class="jxr_string">"TimeUnit '"</span>
<a name="509" href="#509">509</a>                         + value
<a name="510" href="#510">510</a>                         + <span class="jxr_string">"' doesn't exist, using default value '"</span>
<a name="511" href="#511">511</a>                         + DEFAULT_TIMEOUT_UNIT
<a name="512" href="#512">512</a>                         + <span class="jxr_string">"'"</span>, e);
<a name="513" href="#513">513</a>             }
<a name="514" href="#514">514</a>         }
<a name="515" href="#515">515</a> 
<a name="516" href="#516">516</a>         <strong class="jxr_keyword">return</strong> DEFAULT_TIMEOUT_UNIT;
<a name="517" href="#517">517</a>     }
<a name="518" href="#518">518</a> 
<a name="519" href="#519">519</a>     <em class="jxr_javadoccomment">/**</em>
<a name="520" href="#520">520</a> <em class="jxr_javadoccomment">     * </em>
<a name="521" href="#521">521</a> <em class="jxr_javadoccomment">     * @param config</em>
<a name="522" href="#522">522</a> <em class="jxr_javadoccomment">     * @return</em>
<a name="523" href="#523">523</a> <em class="jxr_javadoccomment">     */</em>
<a name="524" href="#524">524</a>     <strong class="jxr_keyword">private</strong> ConnectionFactory getConnectionFactory(<strong class="jxr_keyword">final</strong> Config config) {
<a name="525" href="#525">525</a>         Class&lt;?&gt; clazz;
<a name="526" href="#526">526</a>         String className = <strong class="jxr_keyword">this</strong>.getStringProperty(config, CONNECTION_FACTORY, <strong class="jxr_keyword">null</strong>);
<a name="527" href="#527">527</a> 
<a name="528" href="#528">528</a>         <strong class="jxr_keyword">if</strong> (className == <strong class="jxr_keyword">null</strong>) {
<a name="529" href="#529">529</a>             <strong class="jxr_keyword">if</strong> (<strong class="jxr_keyword">this</strong>.logger.isLoggable(Level.FINE)) {
<a name="530" href="#530">530</a>                 <strong class="jxr_keyword">this</strong>.logger.fine(<span class="jxr_string">"Property '"</span>
<a name="531" href="#531">531</a>                         + CONNECTION_FACTORY
<a name="532" href="#532">532</a>                         + <span class="jxr_string">"' not found in the config, using default class"</span>);
<a name="533" href="#533">533</a>             }
<a name="534" href="#534">534</a>             clazz = DEFAULT_CONNECTION_FACTORY;
<a name="535" href="#535">535</a>         }
<a name="536" href="#536">536</a> 
<a name="537" href="#537">537</a>         <strong class="jxr_keyword">try</strong> {
<a name="538" href="#538">538</a>             clazz = Class.forName(className);
<a name="539" href="#539">539</a> 
<a name="540" href="#540">540</a>             <strong class="jxr_keyword">if</strong> (!ConnectionFactory.<strong class="jxr_keyword">class</strong>.isAssignableFrom(clazz)) {
<a name="541" href="#541">541</a>                 <strong class="jxr_keyword">if</strong> (<strong class="jxr_keyword">this</strong>.logger.isLoggable(Level.SEVERE)) {
<a name="542" href="#542">542</a>                     <strong class="jxr_keyword">this</strong>.logger.log(Level.SEVERE, <span class="jxr_string">"Specified class '"</span>
<a name="543" href="#543">543</a>                             + className
<a name="544" href="#544">544</a>                             + <span class="jxr_string">"' is not a '"</span>
<a name="545" href="#545">545</a>                             + ConnectionFactory.<strong class="jxr_keyword">class</strong>.getName()
<a name="546" href="#546">546</a>                             + <span class="jxr_string">"' implementation, using default class"</span>);
<a name="547" href="#547">547</a>                 }
<a name="548" href="#548">548</a>                 clazz = DEFAULT_CONNECTION_FACTORY;
<a name="549" href="#549">549</a>             }
<a name="550" href="#550">550</a>         } <strong class="jxr_keyword">catch</strong> (ClassNotFoundException e) {
<a name="551" href="#551">551</a>             <strong class="jxr_keyword">if</strong> (<strong class="jxr_keyword">this</strong>.logger.isLoggable(Level.SEVERE)) {
<a name="552" href="#552">552</a>                 <strong class="jxr_keyword">this</strong>.logger.log(Level.SEVERE, <span class="jxr_string">"Impossible to load specified class '"</span>
<a name="553" href="#553">553</a>                         + className
<a name="554" href="#554">554</a>                         + <span class="jxr_string">"', using default class"</span>, e);
<a name="555" href="#555">555</a>             }
<a name="556" href="#556">556</a>             clazz = DEFAULT_CONNECTION_FACTORY;
<a name="557" href="#557">557</a>         }
<a name="558" href="#558">558</a> 
<a name="559" href="#559">559</a>         <strong class="jxr_keyword">try</strong> {
<a name="560" href="#560">560</a>             <strong class="jxr_keyword">return</strong> (ConnectionFactory) clazz.newInstance();
<a name="561" href="#561">561</a>         } <strong class="jxr_keyword">catch</strong> (Exception e) {
<a name="562" href="#562">562</a>             String message = <span class="jxr_string">"Impossible to instantiate '"</span>
<a name="563" href="#563">563</a>                 + clazz.getName()
<a name="564" href="#564">564</a>                 + <span class="jxr_string">"', see nested exceptions"</span>;
<a name="565" href="#565">565</a> 
<a name="566" href="#566">566</a>             <strong class="jxr_keyword">if</strong> (<strong class="jxr_keyword">this</strong>.logger.isLoggable(Level.SEVERE)) {
<a name="567" href="#567">567</a>                 <strong class="jxr_keyword">this</strong>.logger.log(Level.SEVERE, message, e);
<a name="568" href="#568">568</a>             }
<a name="569" href="#569">569</a> 
<a name="570" href="#570">570</a>             <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> RuntimeException(message, e);
<a name="571" href="#571">571</a>         }
<a name="572" href="#572">572</a>     }
<a name="573" href="#573">573</a> 
<a name="574" href="#574">574</a>     <em class="jxr_javadoccomment">/**</em>
<a name="575" href="#575">575</a> <em class="jxr_javadoccomment">     * </em>
<a name="576" href="#576">576</a> <em class="jxr_javadoccomment">     * @param key</em>
<a name="577" href="#577">577</a> <em class="jxr_javadoccomment">     * @return</em>
<a name="578" href="#578">578</a> <em class="jxr_javadoccomment">     */</em>
<a name="579" href="#579">579</a>     <strong class="jxr_keyword">private</strong> String buildHashedKey(<strong class="jxr_keyword">final</strong> String key) {
<a name="580" href="#580">580</a>         <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">this</strong>.keyPrefix + DigestUtils.md5Hex(key);
<a name="581" href="#581">581</a>     }
<a name="582" href="#582">582</a> 
<a name="583" href="#583">583</a>     <em class="jxr_javadoccomment">/**</em>
<a name="584" href="#584">584</a> <em class="jxr_javadoccomment">     * </em>
<a name="585" href="#585">585</a> <em class="jxr_javadoccomment">     * @param group</em>
<a name="586" href="#586">586</a> <em class="jxr_javadoccomment">     * @return</em>
<a name="587" href="#587">587</a> <em class="jxr_javadoccomment">     */</em>
<a name="588" href="#588">588</a>     <strong class="jxr_keyword">private</strong> String buildHashedGroupKey(<strong class="jxr_keyword">final</strong> String groupName) {
<a name="589" href="#589">589</a>         <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">this</strong>.keyPrefix + <strong class="jxr_keyword">this</strong>.groupPrefix + DigestUtils.md5Hex(groupName);
<a name="590" href="#590">590</a>     }
<a name="591" href="#591">591</a> 
<a name="592" href="#592">592</a>     <em class="jxr_javadoccomment">/**</em>
<a name="593" href="#593">593</a> <em class="jxr_javadoccomment">     * </em>
<a name="594" href="#594">594</a> <em class="jxr_javadoccomment">     * @param hashedKey</em>
<a name="595" href="#595">595</a> <em class="jxr_javadoccomment">     * @return</em>
<a name="596" href="#596">596</a> <em class="jxr_javadoccomment">     * @throws CachePersistenceException</em>
<a name="597" href="#597">597</a> <em class="jxr_javadoccomment">     */</em>
<a name="598" href="#598">598</a>     <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">final</strong> Object retrieveFromMemcached(<strong class="jxr_keyword">final</strong> String hashedKey) <strong class="jxr_keyword">throws</strong> CachePersistenceException {
<a name="599" href="#599">599</a>         Object obj = <strong class="jxr_keyword">null</strong>;
<a name="600" href="#600">600</a> 
<a name="601" href="#601">601</a>         <strong class="jxr_keyword">if</strong> (<strong class="jxr_keyword">this</strong>.usingAsyncGet) {
<a name="602" href="#602">602</a>             Future&lt;Object&gt; future = <strong class="jxr_keyword">this</strong>.memcachedClient.asyncGet(hashedKey);
<a name="603" href="#603">603</a>             <strong class="jxr_keyword">try</strong> {
<a name="604" href="#604">604</a>                 obj = future.get(<strong class="jxr_keyword">this</strong>.timeout, <strong class="jxr_keyword">this</strong>.timeUnit);
<a name="605" href="#605">605</a>             } <strong class="jxr_keyword">catch</strong> (Exception e) {
<a name="606" href="#606">606</a>                 future.cancel(false);
<a name="607" href="#607">607</a>                 String errorMessage = <span class="jxr_string">"Impossible to retrieve object from memcache identified by '"</span>
<a name="608" href="#608">608</a>                     + hashedKey
<a name="609" href="#609">609</a>                     + <span class="jxr_string">"'"</span>;
<a name="610" href="#610">610</a> 
<a name="611" href="#611">611</a>                 <strong class="jxr_keyword">if</strong> (<strong class="jxr_keyword">this</strong>.logger.isLoggable(Level.SEVERE)) {
<a name="612" href="#612">612</a>                     <strong class="jxr_keyword">this</strong>.logger.log(Level.SEVERE, errorMessage, e);
<a name="613" href="#613">613</a>                 }
<a name="614" href="#614">614</a> 
<a name="615" href="#615">615</a>                 <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> CachePersistenceException(errorMessage);
<a name="616" href="#616">616</a>             }
<a name="617" href="#617">617</a>         } <strong class="jxr_keyword">else</strong> {
<a name="618" href="#618">618</a>             obj = <strong class="jxr_keyword">this</strong>.memcachedClient.get(hashedKey);
<a name="619" href="#619">619</a>         }
<a name="620" href="#620">620</a> 
<a name="621" href="#621">621</a>         <strong class="jxr_keyword">return</strong> obj;
<a name="622" href="#622">622</a>     }
<a name="623" href="#623">623</a> 
<a name="624" href="#624">624</a>     <em class="jxr_javadoccomment">/**</em>
<a name="625" href="#625">625</a> <em class="jxr_javadoccomment">     * </em>
<a name="626" href="#626">626</a> <em class="jxr_javadoccomment">     * @param hashedKey</em>
<a name="627" href="#627">627</a> <em class="jxr_javadoccomment">     * @param obj</em>
<a name="628" href="#628">628</a> <em class="jxr_javadoccomment">     */</em>
<a name="629" href="#629">629</a>     <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">void</strong> storeInMemcached(<strong class="jxr_keyword">final</strong> String hashedKey, <strong class="jxr_keyword">final</strong> Object obj) {
<a name="630" href="#630">630</a>         <strong class="jxr_keyword">if</strong> (<strong class="jxr_keyword">this</strong>.logger.isLoggable(Level.FINE)) {
<a name="631" href="#631">631</a>             <strong class="jxr_keyword">this</strong>.logger.fine(<span class="jxr_string">"Storing object ('"</span>
<a name="632" href="#632">632</a>                     + hashedKey
<a name="633" href="#633">633</a>                     + <span class="jxr_string">"', '"</span>
<a name="634" href="#634">634</a>                     + obj
<a name="635" href="#635">635</a>                     + <span class="jxr_string">"') with timeout="</span>
<a name="636" href="#636">636</a>                     + <strong class="jxr_keyword">this</strong>.expiration);
<a name="637" href="#637">637</a>         }
<a name="638" href="#638">638</a> 
<a name="639" href="#639">639</a>         Future&lt;Boolean&gt; future = <strong class="jxr_keyword">this</strong>.memcachedClient.set(hashedKey, <strong class="jxr_keyword">this</strong>.expiration, obj);
<a name="640" href="#640">640</a>         <strong class="jxr_keyword">if</strong> (<strong class="jxr_keyword">this</strong>.logger.isLoggable(Level.FINE)) {
<a name="641" href="#641">641</a>             <strong class="jxr_keyword">try</strong> {
<a name="642" href="#642">642</a>                 <strong class="jxr_keyword">boolean</strong> status = future.get(<strong class="jxr_keyword">this</strong>.timeout, <strong class="jxr_keyword">this</strong>.timeUnit);
<a name="643" href="#643">643</a> 
<a name="644" href="#644">644</a>                 <strong class="jxr_keyword">this</strong>.logger.fine(<span class="jxr_string">"Status after set object identified by '"</span>
<a name="645" href="#645">645</a>                             + hashedKey
<a name="646" href="#646">646</a>                             + <span class="jxr_string">"' is '"</span>
<a name="647" href="#647">647</a>                             + status
<a name="648" href="#648">648</a>                             + <span class="jxr_string">"'"</span>);
<a name="649" href="#649">649</a>             } <strong class="jxr_keyword">catch</strong> (Exception e) {
<a name="650" href="#650">650</a>                 future.cancel(false);
<a name="651" href="#651">651</a> 
<a name="652" href="#652">652</a>                 <strong class="jxr_keyword">if</strong> (<strong class="jxr_keyword">this</strong>.logger.isLoggable(Level.SEVERE)) {
<a name="653" href="#653">653</a>                     <strong class="jxr_keyword">this</strong>.logger.log(Level.SEVERE,
<a name="654" href="#654">654</a>                             <span class="jxr_string">"Impossible to know status after setting object identified by '"</span>
<a name="655" href="#655">655</a>                             + hashedKey
<a name="656" href="#656">656</a>                             + <span class="jxr_string">"'"</span>, e);
<a name="657" href="#657">657</a>                 }
<a name="658" href="#658">658</a>             }
<a name="659" href="#659">659</a>         }
<a name="660" href="#660">660</a>     }
<a name="661" href="#661">661</a> 
<a name="662" href="#662">662</a> }
</pre>
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